Under the hood is a naturally aspirated 4.2-liter V8 that produces 450 horsepower. As with all RS models power is sent to all four wheels. In this case Audi uses seven-speed S tronic and an innovative center differential.
New differential can vary the distribution of torque between the front and rear axles. If necessary, up to 70 percent can flow to the front or as much as 85 percent toward the tail end. The 40:60 ratio of the standard rear-biased configuration ensures sporty handling.
The RS5 weighs 1,725 kg (3,802 lbs) and hits 100 km/h in 4.6 seconds, while the top speed is electronically limited to 250 km/h (155 mph). Upon request Audi can increase that to 280 km/h (173.98 mph).
What also impresses is the fuel economy, according to Audi average fuel economy is just 10.8 liters of fuel per 100 km(21.8 mpg).
Compared to the regular A5, it sits 20 mm lower and comes in standard with 19-inch alloy wheels fitted with 265/35 tires. The RS5 optionally comes with 20-inch wheels and 275/30 tires.
Other changes compared to the standard A5/S5 are a new single-frame grille, bigger air inlets for the engine, flared fenders, side sills, two oval exhaust pipes, large diffuser and a rear spoiler.
No information whether RS5 will make it to the States. In Europe prices will start at 77,700 euros.